26581202045 has 4 divisors (see below), whose sum is σ = 31897442460. Its totient is φ = 21264961632.

The previous prime is 26581202029. The next prime is 26581202059. The reversal of 26581202045 is 54020218562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14758119289 + 11823082756 = 121483^2 + 108734^2 .

It is a cyclic number.

It is not a de Polignac number, because 26581202045 - 2⁴ = 26581202029 is a prime.

It is a super-2 number, since 2×26581202045² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26581201996 and 26581202014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2658120200 + ... + 2658120209.

It is an arithmetic number, because the mean of its divisors is an integer number (7974360615).

Almost surely, 2^26581202045 is an apocalyptic number.

It is an amenable number.

26581202045 is a deficient number, since it is larger than the sum of its proper divisors (5316240415).

26581202045 is an equidigital number, since it uses as much as digits as its factorization.

26581202045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5316240414.

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 26581202045 in words is "twenty-six billion, five hundred eighty-one million, two hundred two thousand, forty-five".